Saw-set.



PATENTED JULY 2, 1907.

F. KRAHENBUHL.

SAW SET.

APPLIOATION FILED APB.10,1906.

. INVEN TOR. 5; W,

ATTORNEY.

UNITED STATES PATENT OFFICE.

SAW-SET.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed April 10,1906. Serial No. 310,921.

To all whom it may concern:

" Be it known that I, FRED KRAHENBUHL, a citizen of Switzerland,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements inSaw-Sets, of which the following is a specification.

This invention relates to improvements in saw sets, the object of theinvention being to provide a saw set which can be used equally well forsetting saws either with line or with large teeth.

In the accompanying drawing, Figure 1 is a side elevation of my improvedsaw set, open; Fig. 2 is a longitudinal section of the same closed upona saw; Fig. 3 is a bottom plan view of the upper jaw; Fig. 4 is a topplan view of the lower jaw; Fig. 5 is a cross section on the line 55 ofFig. 2; Fig. 6 is a cross section on the line 66 of Fig. 2.

Referring to the drawing, 1 represents the upper jaw and 2 the lower jawof the saw set, said jaws being pivoted at 3 and having handles 4, 5,pressed apart by a spring 6. Around the lower jaw extends a yoke 7,having lips 8 adapted to enter any one of a series of pairs of grooves9, formed upon the upper surface of the lower jaw, the grooves of eachpair lying on opposite sides of a smooth surface 10 of said jaw uponwhich rests the tooth of the saw 11 to be set. Said lips are seciu'ed inplace by a screw 25. The saw itself then rests upon a lower clampingplate 12, the inner end of which rests upon the jaw 2, while its outerend is adjusted by a screw 13 so as to give to the blade of the saw thedesired angle relative to the teeth. This plate is normally drawn downby means of a stretched spring 14 attached at one end to the lower jawand at the other end to a cross pin 15 secured across a hole in saidplate. The adjusting screw 13 holds up said plate against the tension ofthe spring.

The upper jaw has a sharp edge 16 which extends over the surface 10 ofthe lower jaw, so that when the jaws are brought together, saidedgedescends upon said tooth, and holds it firmly upon the surface 10. Atthe same time an upper clamping plate 17 carried by the upper jawdescends upon the lower clamping plate 12 and clamps the blade of thejaw between said plates. The position of said plate relatively to theupper jaw is adjusted by a nut 18 screwed on a threaded rod 19 passingloosely through the end of the upper jaw, the lower end of the rod beingpivoted to the outer end of the clamping plate 17. A coiled spring 20around said rod and compressed between the outer end of the upper jawand the end of the upper clamping plate serves to depress the outer endof said clamping plate when the nut is screwed up on the threaded rod,while by screwing the nut down upon said rod the outer end of saidclamping plate is drawn upwards against the spring. At the same time theinner end of said clamping plate is pressed down by means of a strongplate spring 22 pivotally secured to said inner end and also to theouter end of the upper jaw. This plate spring permits the inner end ofthe upper clamping plate to yield so as to adjust the inclination of theupper clamping plate to that of the lower, so that the two clampingplates can grasp the blade of the saw firmly along their whole lengths.

For the purpose of determining the angle of inclination which has beengiven to the lower clamping plate the lower adjusting screw is flattenedon one side, as shown at 24, so as to carry index marks to indicate theamount of elevation of the outer end of the lower clamping plate.

Theoperation of the device is therefore as follows:- The lower clampingplate is adjusted by its adjusting screw until it makes the desiredangle of inclination to the part of the lower jaw upon which the toothrests. Then the clamping plate of the upper jaw is adjusted accordingly,bearing in mind the thickness of the saw which is to be operated upon,so that the upper clamping plate will lie as nearly as possible parallelwith the lower clamping plate. At the same time the yoke 7 is adjustedin the pair of grooves which corresponds with the depth of the teeth ofthe saw. The saw is now inserted so that the teeth thereof will abutagainst the yoke so adjusted, and the tooth that is to be set is placedon the surface 10 in position to be depressed by the sharp edge 16 ofthe upper jaw. The jaws are then closed. The clamping plates cometogether, clamping the blade of the saw and holding it firm at the givenangle, and at the same time the sharp edge 16 bears down on the tooth ofthe saw and bends it to the desired set. The handles are then opened,the saw is moved forward to bring the next tooth into the same place andthe operation is repeated.

The important features of my invention I consider to be, first, thelower clamping plate, the outer end of which is adjustable to give theplate any desired slope to the bearing surface 10; second, the upperclamping plate connected at the inner end to the upper jaw to bear downupon the saw blade and clamp it against the lower clamping jaw with aneven pressure throughout its whole length; third, the support for theteeth when they are being set, this solid support furnishing a goodgrasp for the teeth while at the same time the blade itself is held bythe clamping plates; fourth, the

series of grooves andthe yoke adjustably secured therein for placing thesaw teeth in the proper position to be operated upon.

I claim:-

1. A saw set having jaws provided with means for bending a tooth, one ofsaid jaws having a clamping plate, :1 plate spring connecting the innerend of said plate with the jaw, and a yielding-connection foradjustahlysecuring t0 the jaw the other end of the clamping plate,substan- 1() tially as described.

2. A saw set having jaws formed with unyielding surfaces adapted to holda tooth of a saw, and having clamp ing plates for clamping the sawblade, said clamping plates being independently angularly adjustablerelatively to the jaws and resilient supports for the ends of one ofsaid plates, substantially as described. I

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

FRED I'utAHENBUHL.

Witnesses IBESSLE -GORFINKEL,

HAZEL RIVERS.

